薄壁结构砼的裂缝与处理

分析了万年闸船闸砼工程结束后薄壁砼结构墙体出现大面积贯通性裂缝的发生原因,提出了修复裂缝的工艺方案,总结了预防此类裂缝发生的有效措施。     

固壁紊流流速分布指数型公式和阻力规律——(Ⅱ)过渡区

基于相似理论中的不完全自相似假设,研究了固壁紊流流速分布的结构型式。通过对壁面紊流结构的分析,进而给出了固壁紊流包括光滑区、过渡区和粗糙区在内的统一的指数型流速分布公式和阻力规律,并用尼库拉兹的实验资料作了验证。     

土钉墙模型试验分析

通过土钉墙模型试验,研究土钉的分布对上钉墙成形整体的作用,超载对土钉墙的影响。     

上海地区饱和粉土层中土钉墙支护的工程实践

通过虹祺花苑复合式土钉墙工程实例,阐述饱和粉土层中的土钉墙支护计算原理及现场施工要点,并总结了技术要点及注意事项以资推广。     

Computation of solitary waves during propagation and runup on a slope

A numerical time-simulation algorithm for analysing highly nonlinear solitary waves interacting with plane gentle and steep slopes is described by employing a mixed Eulerian–Lagrangian method. The full nonlinear free surface conditions are considered here in a Lagrangian frame of reference without any analytical approximations, and thus the method is valid for very steep waves including overturning. It is found that the runup height is crucially dependent on the wave steepness and the slope of the plane. Pressures and forces exerted on impermeable walls of different inclinations (slopes) by progressive shallow water solitary waves are studied. Strong nonlinear features in the form of pronounced double peaks are visible in the time history of pressure and force signals with increasing heights of the oncoming solitary waves. The effect of nonlinearity is less pronounced as the inclination of the wall decreases with respect to the bottom surface.     

考虑桩顶冠梁效应的水泥土挡墙变形计算方法

以ｍ法为基础,建立了考虑桩顶冠梁效应的挡墙变形计算模型,给出了计算公式。工程实例表明：该方法预测挡墙变形是可行的。     

海啸作用下滨水挡土墙抗震转动稳定性上限分析

地震诱发的海啸对沿海围护结构的破坏具有强度大的特点。滨水挡土墙作为重要的围护结构,海啸与地震的联合作用极易造成其发生绕墙踵的被动破坏。采用条分法,将土楔体分割成无数平行于破裂面的刚性土条,并建立绕墙踵转动的挡墙与刚性土条之间的速度容许场。基于极限上限理论,依据外力做功功率等于其内能耗散功率,推导了地震加速度系数的表达式。与经典极限平衡理论相比,该方法考虑了挡墙的位移模式,且无需假设地震土压力的作用位置。分析了浪高与海平面高度之比,内摩擦角φ及墙土摩擦角δ对滨水挡土墙稳定性的影响。     

Boundary frame contribution in coupled and uncoupled steel plate shear walls

The steel plate shear wall (SPSW) system is a robust option for earthquake resistance due to the strength, stiffness, ductility and energy dissipation that it provides. Although thin infill plates are efficient for resisting lateral loads, boundary frames that are proportioned based on capacity design requirements add significant structural weight that appears to be one of the factors limiting the use of the system in practice. An alternate configuration, the SPSW with coupling (SPSW‐WC), was explored recently as an option for increasing architectural flexibility while also improving overall system economy and seismic performance. The SPSW‐WC, which extensively employs flexural boundary frame contribution, has shown promise in analytical, numerical and experimental studies, but recent research on uncoupled SPSWs suggests that boundary frame contribution should not be considered for carrying seismic design shear. As a result, in the present study, boundary frame contribution in SPSWs was explored with detailed three‐dimensional finite element models, which were validated against large‐scale SPSW‐WC tests. Six‐story systems were considered, and the study matrix included single and double uncoupled SPSWs along with coupled SPSWs that had various degrees of coupling. Variations in design methodology were also explored. The modeling framework was employed to conduct static monotonic and cyclic pushover analyses and dynamic response history analysis. These analyses demonstrate the beneficial effect of coupling in SPSWs and illustrate the need to consider boundary frame contribution in design of coupled SPSWs. In addition, sharing design shear between the infill plate and the boundary frame is more generally shown to not be detrimental if this sharing is done in the design stage based on elastic analysis and the resulting boundary frame provides adequate secondary strength and stiffness following infill plate yielding. Copyright © 2017 John Wiley & Sons, Ltd.     

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。     

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。