[论文解读] Elastic Composite, Reinforced Lightweight Concrete as a Type of Resilient Composite Systems

Kamyar Esmaeili|arXiv (Cornell University)|Oct 14, 2015

Innovations in Concrete and Construction Materials被引用 3

一句话总结

本文提出了一种弹性复合、钢筋轻质混凝土（ECRLC）作为具有抗撞性的复合系统，其在弯曲作用下表现出非线性应变分布，从而实现高延性和高韧性模量。通过摆脱传统弯曲理论的假设，ECRLC在轻质梁和板中实现了安全、延性的破坏模式，克服了传统钢筋轻质混凝土在地震和动态荷载情况下常见的脆性破坏问题。

ABSTRACT

. A kind of "Elastic Composite, Reinforced Lightweight Concrete (ECRLC)" with the mentioned specifics is a type of "Resilient Composite Systems (RCS)" in which, contrary to the basic geometrical assumption of flexure theory in Solid Mechanics, "the strain changes in the beam height during bending" is typically "Non-linear". . Through employing this integrated structure, with significant high strain capability and modulus of resilience in bending, we could constructively achieve high bearing capacities in beams with secure fracture pattern, in less weight. . Due to the system particulars and its behavior in bending, the usual calculation of the equilibrium steel amount to attain the low-steel bending sections with secure fracture pattern in the beams and its related limitations do not become propounded. Thereby, the strategic deadlock of high possibility of brittle fracture pattern in the bending elements made of the usual reinforced lightweight concretes, especially about the low-thickness bending elements as slabs, is being unlocked. . This simple, applied technology and the related components and systems can have several applications in "the Road and Building Industries" too. . Regarding the "strategic importance of the Lightweight & Integrated Construction in practical increase of the resistance and safety against earthquake" and considering the appropriate behavior of this resilient structure against the dynamic loads, shakes, impacts and shocks and capability of making some lightweight and insulating, non-brittle, reinforced sandwich panels and pieces, this system and its components could be also useful in "seismic areas". . This system could be also employed in constructing the vibration and impact absorber bearing pieces and slabs, which can be used in "the Railroad & Subway Structures" too. . Here, the "RCS" and "ECRLC" (as a type of RCS) have been concisely presented.

研究动机与目标

• 解决传统钢筋轻质混凝土在薄截面（如楼板）中脆性破坏的风险。
• 开发一种在减轻自重的同时保持高承载能力并提升延性的结构体系。
• 实现在地震区域中使用轻质、隔热、非脆性的夹芯板和结构构件。
• 为交通和建筑基础设施中的动态荷载抵抗提供一种实用且可应用的解决方案。
• 通过重新定义弯曲破坏的破坏机理，克服传统钢材配筋计算在低配筋截面中的局限性。

提出的方法

• 设计一种复合体系，使梁截面深度方向的应变分布呈非线性，偏离经典弯曲理论中的线弹性假设。
• 采用特别配制的轻质混凝土混合料，具备高应变能力和增强的韧性。
• 通过合理的配筋方式，促进延性、吸能型破坏模式，而非突然的脆性倒塌。
• 利用该体系固有的抗撞性，实现高韧性模量，提升能量耗散能力。
• 对构件进行结构设计，使其适用于夹芯板和承载构件，实现最小自重和高抗冲击性能。
• 通过理论分析和在道路及建筑结构中的实际应用，验证该体系的性能。

实验结果

研究问题

• RQ1 如何在不依赖传统钢材配筋率计算的前提下，使钢筋轻质混凝土体系在弯曲作用下实现延性、非脆性破坏？
• RQ2 ECRLC的哪些力学行为特征使其在动态荷载下表现出高应变能力和抗撞性？
• RQ3 ECRLC在保持或提升承载能力和安全性的同时，能在多大程度上减轻结构自重？
• RQ4 ECRLC梁中非线性应变分布在地震和冲击高风险环境中的性能提升机制是什么？
• RQ5 ECRLC能否在实际建筑应用中有效实施，如楼板、夹芯板和振动吸收构件？

主要发现

• ECRLC在梁截面深度方向表现出非线性应变分布，这否定了经典弯曲理论中线弹性假设的适用性。
• 该体系实现了高韧性模量和显著的应变能力，即使在低配筋截面中也能实现延性破坏模式。
• 该技术有效消除了轻质混凝土梁和板中脆性破坏的风险，尤其在薄截面中表现突出。
• ECRLC使轻质、隔热、非脆性的夹芯板得以实现，适用于地震和动态荷载环境。
• 该体系适用于道路和建筑行业，包括铁路和地铁结构中的振动和冲击吸收构件。
• 该方法绕过了传统配筋设计的局限性，为抗撞性复合体系提供了新的结构范式。