填充墙刚度影响的实测高层建筑增量动力分析

高层结构中的填充墙在地震作用下与周围结构构件之间的相互作用十分复杂,对建筑结构的整体抗震性能具有较大影响。然而我国规范在设计阶段通常不考虑填充墙对结构抗震性能的影响,统一采用周期折减系数来考虑其刚度变化引起的内力变化,因此准确评估填充墙对结构抗震性能的影响具有重要意义。本文在对一栋框-剪结构和一栋剪力墙高层建筑进行随机振动测试的基础上,利用Perform-3D对每栋高层分别建立了3种分析模型。其中对未考虑填充墙作用的结构模型,分别采取规范建议值和实测结果值两种方式进行周期折减。对通过添加斜撑单元来考虑填充墙作用的结构模型,利用环境激励测试识别获得的结构模态信息进行模型修正。对该3种模型进行了增量动力分析,探讨潜在危险性水平地震作用下填充墙对高层建筑抗震性能的影响。结果表明,填充墙增加了结构在弹性阶段的整体初始刚度,但随着地震动强度的增加逐渐丧失对结构刚度的贡献作用。相比考虑了填充墙作用的模型计算结果,规范建议的周期折减系数较为保守。同时研究发现,填充墙对高层框-剪结构的影响程度要比剪力墙结构大。     

基于FEA的填充墙与隔震器协同抗震系统性能分析

隔震器与填充墙对建筑抗震性能有很大作用。为了探究填充墙布置形式及填充材料和隔震器协同作用对钢筋混凝土框架结构动力特性及抗震性能的影响,采用等效斜撑理论,对3种不同填充墙布置形式与隔震器协同作用的抗震系统方案进行对比分析,研究发现顶层不布置填充墙与隔震器协同抗震系统钢筋混凝土框架结构的抗震性能最佳。在此系统上分析了不同填充材料对钢筋混凝土框架结构抗震性能的影响,结果表明,加气混凝土砌块填充墙的钢筋混凝土框架结构抗震性能最好。     

Study on a new shear wall system with shaking table test and finite element analysis

A new seismic energy dissipation shear wall structure is proposed in this paper. The new shear wall is one with purposely built‐in vertical slits within the wall panel, and rubber belts as seismic energy dissipation devices are installed in the vertical slits. In order to verify this concept, shaking table tests of a 10‐storey shear wall model with rubber belts filled in the vertical slits were carried out, and comparison of seismic behaviour was made between the new shear wall system and a shear wall with reinforced concrete connecting beams as energy dissipation. Furthermore, the seismic behaviour of this new shear wall is analysed by a finite element time history analysis method. The test and analysis show that the new shear wall system has a very good ability to dissipate seismic energy and is easy to use in engineering practice. Copyright © 2000 John Wiley & Sons, Ltd.     

煤层陷落柱多波地震数值模拟与成像研究

陷落柱是煤田勘探开发中常见的地质灾害体,陷落柱的精确探测一直是煤田安全生产研究的重点,单纯依靠常规纵波地震勘探技术难以满足现阶段煤田精细勘探的需求。多波地震勘探技术能够获得纵波和转换波地震资料,提供更丰富的波场信息,且转换波对于埋深较浅的小幅度构造有更高的分辨率,充分利用多分量地震资料可以有效的提高地震勘探的精度。本文将多波地震技术应用到煤层陷落柱研究中,利用数值方法对煤层陷落柱进行多波地震勘探模拟研究,采用弹性波有限差分方法对构建的陷落柱模型进行多分量正演模拟,然后分别对波场分离后的PP波和PS波地震数据进行叠前深度偏移成像测试。通过对两个小尺寸陷落柱模型进行多波地震数值试算表明,多波地震勘探技术是一种有效的煤层陷落柱探测方法,充分利用多波地震资料有利于查明煤层陷落柱构造,对陷落柱取得更好的勘探效果。     

临沂市城区岩溶塌陷特征及成因分析

自20世纪80年代以来,临沂市城区一带发生多起岩溶塌陷,这些岩溶塌陷发生具有突发性、重复性,其分布具有一定的规律性;其形成原因一方面取决于该区具备岩溶塌陷形成的物质基础条件,另一方面取决于水动力条件的改变,而水动力条件的改变主要是由于城区地下水不合理开采造成的。     

PERFORMANCE EVALUATION OF A THREE-STOREY UNREINFORCED MASONRY BUILDING DURING THE 1992 ERZİNCAN EARTHQUAKE

Seismic performance of a three-storey unreinforced masonry building which survived the 1992 Erzincan earthquake without damage is evaluated. Mechanical properties of the masonry walls have been determined experimentally by using identical brick and mortar used in construction. An accurate material model is developed for masonry and employed in a computer program for the non-linear dynamic analysis of masonry buildings. The analytical results based on measured material properties indicated that masonry buildings which satisfy basic seismic code requirements possess remarkable lateral strength, stiffness and energy dissipation capacity. Accordingly, a simple elastic design approach is rendered suitable for unreinforced masonry under seismic excitations, provided that realistic material properties are employed in design.     

SHORT COMMUNICATIONS FLEXURAL CAPACITY OF EDGE LOADED ANNULAR FOUNDATIONS

Edge loaded annular foundations have been analysed assuming the soil pressure at the contact to be non-uniform using the lower bound approach of Limit Analysis. Variable fixity at the edges has been allowed and the foundation slab is made to follow the Square yield criterion. Results presented in the form of curves can be readily used to obtain the locations of the yield hinge circles for the given slab and the corresponding collapse load. © 1997 John Wiley & Sons, Ltd.     

钢筋混凝土短肢剪力墙抗震性能试验研究

通过6片1：2单层短肢墙试体的低周反复荷戴试验,研究了在低周反复荷载作用下钢筋混凝土短肢剪力墙的整体工作性能、破坏形态及滞回特性。结果表明：试件的最终破坏均是由连梁失效引起的,连梁是短肢剪力墙结构的薄弱环节,因此,连梁的混凝土强度不应低于墙肢的混凝土强度,以免连梁出现粘结破坏;有翼墙的短肢剪力墙试体其延性系数都达到了3．5以上．其耗能能力较无翼墙短肢墙好。     

带暗支撑T形截面短肢剪力墙抗震性能试验研究

通过6个1：2缩尺的T形截面带暗支撑短肢剪力墙模型的低周反复荷载试验研究,分析比较了带暗支撑T形截面短肢剪力墙和普通T形截面短肢剪力墙的承载力、刚度及其衰减过程、延性、耗能、滞回特性及破坏特征。试验表明,加设钢筋混凝土暗支撑可显著提高T形截面短肢剪力墙的抗震性能。     

王家官庄旧村改造基坑支护设计与施工实践

介绍了青岛市即墨区王家官庄旧村改造项目基坑支护设计方案与基坑支护实施情况,该工程地层条件复杂,地下水丰富,又靠近石鹏水库,环境条件较复杂,通过采用土钉墙与高压旋喷桩止水帷幕,基坑降水等技术措施的顺利实施,基坑支护效果良好,确保了地下车库基坑开挖、基础施工的安全,施工质量满足相关技术要求。